Topics requested for admission to the doctoral study PE-PEM

Physical Engineering - department of materials (physical engineering of materials) 

  1. Crystal lattice defects, mechanisms of the plastic deformation, interaction of dislocations with obstacles, stain hardening. Static and dynamic recovery, static and dynamic recrystallization.
  2. Equilibrium phase diagrams. Dispersion hardening of metallic materials. Decomposition of the supersaturated solid solution, nucleation and growth of precipitates, precipitate free zones.
  3. Behaviour of the metallic materials at low and high temperatures. Creep, superplasticity. Radiation damage of materials.
  4. Phase transformation in steels during heat- and thermo-mechanical treatment. Influence of alloying elements. Time temperature transformation (TTT) and continuous cooling transformation (CCT) diagrams for austenite decomposition. Pearlitic, bainitic and martensitic transformation.
  5. Basic experimental methods for characterisation of physical and mechanical properties of materials.
  6. Interaction of X-rays and electrons with matter, diffraction, Bragg´s law.
  7. Phase transformations in materials and their use in thermomechanical treatment.
  8. Basic terms and formulations of linear elasticity theory. Theory of deformation, strains in terms of displacements, theory of stress, equilibrium equations, Hooke’s law, boundary conditions, strain energy.
  9. Elastic pure bending of beams. Cross-sectional stress and its calculation. deflection calculation.
  10. 2D problem: plane stress, plane strain. Airy's stress function.
  11. Fracture modes. Parameters of linear and nonlinear fracture mechanics, K-factor, fracture toughness and factors which it depends on. Transient temperature. Permissible crack length.
  12. High- and low- cycle fatigue. Wöhler S-N curve, fatigue limit. Initiation of fatigue crack. Threshold of stress intensity factor range for fatigue crack propagation, factors affecting it. Fatigue crack growth rate as a function of ΔK.
  13. Failure processes and their fractographic features. Experimental methods of investigation of material properties in the microvolume (indentation, local electron microanalysis).